package org.smart4j.chapter1.util;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PropsUtil {
	private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);
	
	/**加载属性文件
	 * @param fileName
	 * @return
	 */
	public static Properties loadProps(String fileName){
		Properties props = null;
		InputStream is = null;
		try{
			is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
			if(is == null) {
				throw new FileNotFoundException(fileName + " file is not found");
			}
			props = new Properties();
			props.load(is);
		} catch (IOException e) {
			LOGGER.error("load properties file failure", e);
		} finally{
			if(is !=null){
				try {
					is.close();
				} catch (IOException e) {
					LOGGER.error("close input stream failure" ,e);
				}
			}
		}
		return props;
	}
	
	public static String getString(Properties props,String key){
		return getString(props,key,"");
	}

	public static String getString(Properties props, String key, String defalutValue) {
		String value = defalutValue;
		if(props.containsKey(key)){
			value = props.getProperty(key);
		}
		return value;
	}
	/**
	 * 获取Int型属性（默认值为0）
	 * @param props
	 * @param key
	 * @param defalutValue
	 * @return
	 */
	public static int getInt(Properties props ,String key){
		return getInt(props,key,0);
	}

	
	/**
	 * 获取Int型属性（可指定默认值）
	 * @param props
	 * @param key
	 * @param defalutValue
	 * @return
	 */
	public static int getInt(Properties props, String key, int defalutValue) {
		int value = defalutValue;
		if(props.containsKey(key)){
			value = CastUtil.castInt(props.getProperty(key));
		}
		return value;
	}
	
	/**获取布尔型属性（默认值为false）
	 * @param props
	 * @param key
	 * @return
	 */
	public static boolean getBoolean(Properties props ,String key){
		return getBoolean(props,key,false);
	}

	/**
	 * 获取布尔类型属性（可指定默认值）
	 * @param props
	 * @param key
	 * @param defalutValue
	 * @return
	 */
	public static boolean getBoolean(Properties props, String key, boolean defalutValue) {
		boolean value = defalutValue;
		if(props.containsKey(key)){
			value = CastUtil.castBoolean(props.getProperty(key));
		}
		return value;
	}
	
}
